When we have a uniformly charged ring, if we evaluate the electric potential at the center of the ring, that is x=0, v=(k/a)Q, that is V remains constant and the electric field E will be zero, Physically, why is it that at the center of a uniformly charged ring its electric potential is constant and its electric field is zero?

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Electric Charges and Fields

One of the fundamental properties is the electromagnetic property. Charge cannot be destroyed by any process and this contributes formally to the law of charge conservation.